The uncapped Liverpool teenager Trent Alexander-Arnold has been included in England’s squad for the summer’s World Cup after Gareth Southgate revealed a youthful 23-man party “which we can be excited about” for the tournament in Russia.

The 19-year-old joins a squad with only 11 previous appearances at the finals and only five survivors from Roy Hodgson’s party who failed to emerge from the group stage in Brazil four years ago. Gary Cahill, recalled after his omission for the friendlies against the Netherlands and Italy in March, is one of that quintet and now finds himself the most experienced member of the travelling party with 58 caps. With an average age marginally over 26, this will be the third youngest squad selected by England for a World Cup.

England's World Cup squad for Russia 2018: Southgate's final 23 – in pictures

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There are places for Ruben Loftus-Cheek, who was capped twice in November and enjoyed an impressive year on loan at Crystal Palace from Chelsea, and Manchester City’s Fabian Delph, whose last cap came in November 2015. Adam Lallana, who managed a solitary Premier League start for Liverpool all season and whose 16-minute cameo on the final afternoon represented a first involvement in six weeks, has only been selected among five standby players. As anticipated, there is no place for Joe Hart, Ryan Bertrand or Jack Wilshere, while Alex Oxlade-Chamberlain and Joe Gomez are injured.

“I believe this is a squad which we can be excited about,” said Southgate, who will welcome all but the contingent from the FA Cup finalists, Chelsea and Manchester United, and Liverpool, as Champions League finalists, to St George’s Park on Monday to begin preparations for Russia. “It is a young group but with some really important senior players, so I feel the balance of the squad is good, both in terms of its experience, its character and also the positional balance.

“We have a lot of energy and athleticism in the team but players who are equally comfortable in possession of the ball and I think people can see the style of play we’ve been looking to develop. The selection process has been over months really, it’s not just been the last few weeks. We feel the team are improving and we want to continue that momentum.”

Only in 1958 and 2006 did England travel to a World Cup with a younger squad and 11 of the 23 have fewer than 20 caps.

Alexander-Arnold, who has made three appearances for the under-21s, had been invited to train with the senior squad in the buildup to the games against the Dutch and the Italians and has enjoyed an impressive season at Anfield. He has made the most of the absence through injury of Nathaniel Clyne and Gomez for long periods and played a key role in the Liverpool’s Champions League knockout victories over Manchester City and Roma.

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Southgate has monitored his progress closely. “The first call-up for Trent Alexander-Arnold is well deserved,” he said. “When we pick young players, it’s not just because they are young, it’s because their performances deserve it. We’ve also had a couple of injuries with Alex Oxlade-Chamberlain and Joe Gomez, which is a huge blow for them personally and disappointing for us.”

Alexander-Arnold offers back-up to Kieran Trippier and Kyle Walker at right wing-back and could be utilised in midfield if required, having featured there for Liverpool. The teenager, along with his club-mate Jordan Henderson, will link up with the squad after the friendly with Nigeria next month, as Southgate is insistent his players enjoy a week’s break after the end of their club seasons. The Football Association’s medical staff are confident the knee injury sustained by Trippier, which sidelined him on the final day of the season, will not hamper him in Russia, and they will assess him again when he joins the squad with the squad.

Southgate has spent time speaking to those players who did not make the final cut and while Wilshere has not played for his country since the Euro 2016 defeat to Iceland, there were difficult conversations with Bertrand and Hart, who had played significant parts in qualifying and would have expected to be involved.

“Ryan and Joe have played a lot over the last two years, so they’re not decisions we took lightly,” the manager said. “I could’ve had easier conversations by keeping them involved. With Joe, we’ve got three other goalkeepers who have had very good seasons and the decision I was faced with was: ‘Do I keep Joe in and have experience around the group? Or give the three guys who have basically had a better season a chance?’ We felt the players all needed to be in on merit.

“Ryan is also very unfortunate in that it’s probably one of the strongest positions we have. Ryan has had a decent season but I just felt the others were ahead of him. Both calls were really tough. They’re both good guys and have contributed a lot throughout qualification, so it wasn’t an enjoyable part of the job and I feel it’s important to acknowledge their contribution in getting us to Russia.”

Neither has been included on the five-man standby list, with Lallana joined by Burnley’s Tom Heaton and James Tarkowski, Lewis Cook of Bournemouth and West Brom’s Jake Livermore. They will join the squad at the training camp next week in the hope an opportunity presents itself, with Lallana to be promoted to the 23 if any of the forward options succumbs to injury in the next few weeks.

“History tells us that one of those standby players may end up in the squad, as it’s very unusual for us to get through the end of the season and our two preparation games without any issues,” Southgate said. “All of the guys on standby have been really professional in their approach to this. They recognise there’s still an opportunity and we’ve had a lot of conversations over a period of time about their situation.”